The radio properties of the cD galaxy of Abell 2390 |
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| Authors: | Pedro Augusto Alastair C Edge Claire J Chandler |
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| Institution: | Centro de Astrofísica da Universidade do Porto, Rua do Campo Alegre, 823, 4150 Porto, Portugal;Universidade da Madeira, Centro de Ciências Matemáticas, Caminho da Penteada, 9050 Funchal, Portugal;University of Durham, Department of Physics, South Road, Durham DH1 3LE;National Radio Astronomy Observatory, PO Box O, Socorro, NM 87801,USA |
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| Abstract: | We present multifrequency, multi-epoch radio imaging of the complex radio source B2151+174 in the core of the cluster, Abell 2390 ( z ? 0.23) . From new and literature data, we conclude that the Faranoff–Riley type II (FRII)-powerful radio source is the combination of a compact, core-dominated 'medium-sized symmetric object' (MSO) with a more extended, steeper spectrum mini-halo. B2151+174 is unusual in a number of important aspects. (i) It is one of the most compact and flat spectrum sources in a cluster core known; (ii) it shows a complex, compact twin-jet structure in a north–south orientation; (iii) the orientation of the jets is 45° misaligned with apparent structure (ionization cones and dust disc) of the host galaxy on larger scales. Since the twin-jet of the MSO has its northern half with an apparent 'twist', it might be that precession of the central supermassive black hole explains this misalignment. B2151+174 may be an example of the early stage (103–104 yr duration) of a 'bubble' being blown into the intracluster medium where the plasma has yet to expand. |
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| Keywords: | galaxies: active galaxies: clusters: individual: Abell 2390 galaxies: elliptical and lenticular cD |
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